This list of implied characters is a list of characters that have not physically appeared in any form of media in time. Regardless of their lack of appearance, the implied characters have been mentioned at least once throughout Rocko Squad Prime.
Ellen's deceased yet unnamed mother. Mentioned in Sleepy Ellen when Ellen needed the Rocko Squad's help.
Stacie's deceased yet unnamed parents. Mentioned in Ellen's Bad Day when Evil Man knew that Stacie's family died.
Stacie's deceased eight-year-old sister. Mentioned in Ellen's Bad Day when Stacie told her new friends that she and her sister were sinking in mud.
Olivia's deceased grandfather. Appears in the Team Umizoomi episode called To the Library, but mentioned in Not So Sleepy Olivia after Jin Kazama wanted Olivia to take an apology note about her grandfather's death.
Veruca Salt's father. Mentioned in almost all of Veruca's appearances.
One of the three girls from Mary-Kate and Ashley Olsen's sleepover party. Mentioned in Fun Safari after Evil Man thinks Abby's big sister is aware of Ashley's sadness but realizes that he's talking about another Vanessa.
Jill Walker's deceased mother. Appears in the Barney & Friends episode called A Game for Everyone portrayed by Jacqueline Berner, but mentioned by Evil Man in Jolted Jaclyn after hearing about Jill's sadness.